Baseboard Jumpers - NEC Express 5800/140Rb-4 Service Manual

Baseboard Jumpers

Jumpers on the baseboard are organized into three groups: boot block jumpers (JP3), main jumpers
(JP4, JP5, and JP6), and serial port B jumpers (JP25). Figure 62 identifies the jumper blocks and
pin numbers. The function of each pair of pins is described in the sections that follow.
Boot Block Jumpers
The boot block jumpers are used when updating the BIOS or BMC firmware in the unusual event
that the boot block area needs to be updated. These jumpers are not used for routine firmware
updates. Use the boot block jumpers only when the instructions with a firmware update specifically
say to do so. When you do need to enable either of these features, use one of the spares from
JP4 pins 1 and 2 or JP25 pins 7 and 8. Table 12 identifies the function of each pin pair on JP3.
Table 12. Boot Block Jumper Descriptions
Jumper
Block Pins
1-8
9-10
JP3
11-12
Server Description
Figure 62. Baseboard Jumpers and its default setting
Jumper Name—Effect when shorted.
Reserved.
BMC Boot Block Write Enable—Allows the BMC boot block to be overwritten when
updating the BMC firmware.
BIOS Boot Block Write Enable—Allows the BIOS boot block to be overwritten when
updating the BIOS.
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